Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc63ed68e7a14a39…

MALICIOUS

PDF

77.0 KB Created: 2021-03-09 22:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fe9a28681527e5ceaf5efb94e70cd859 SHA-1: 6efdce5e9c463bfd56e4a47a70e17256388f451e SHA-256: dc63ed68e7a14a39de64965db03bdc011c170adbb54198222add1f4d91231cc8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL, https://kuzutuzo.ru/strik?utm_term=how+to+read+sears+battery+charger, is likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=how+to+read+sears+battery+charger PDF link annotation
    • https://kuxobemif.weebly.com/uploads/1/3/1/3/131379353/2d6f8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424364/normal_5fdea29f5a69e.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/surusemiritut.pdfIn PDF document text
    • https://mudabomem.weebly.com/uploads/1/3/0/9/130969182/sakukur.pdfIn PDF document text
    • http://republvinb.fun/62223763661ua5b4.pdfIn PDF document text
    • http://storeeu.info/attraction_2017_dual_audio_movierxtww.pdfIn PDF document text
    • http://my-favshopg.online/a_static_budget_is_appropriate_forosmjl.pdfIn PDF document text
    • http://uber-global.com/eclipse_java_swing_designerz4596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501193/normal_6037f093804e3.pdfIn PDF document text
    • https://dupudebokuvufex.weebly.com/uploads/1/3/2/3/132303235/11c9c21f2b91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_5fe81e1b3208b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415070/normal_5feda5071f7ee.pdfIn PDF document text
    • http://paktum.pro/chemistry_12_worksheet_4-3_ph_and_poh_calculations_answershmmgc.pdfIn PDF document text
    • https://dumiwezabofovo.weebly.com/uploads/1/3/4/7/134743005/6141501.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_114a71d84e4d4427b61e73882ae2408f.pdf?index=trueIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_a04483b8d3df483eb44447aba9ca9510.pdf?index=trueIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_69c80c65f13f40939adfea0be2cdd372.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d62767-438d-4e61-83ad-5dd7833d130f/62313266173.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_104674e03c4d4724a5b1f5768bac6a89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe9e2e66-c70d-4a67-aeac-6a18e7a29554/how_to_work_cobra_radar_detector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7bdba4d-034c-41a9-9623-1c04e96d914f/54709374754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6bd0bd8-4bc1-4c3c-b0a9-7d1fc19e34fa/how_to_shade_with_pencils_for_beginners.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_66a0554446524731a4af599cdbaf70eb.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 5464 bytes
SHA-256: 35981da927205a280e70c85bd31df09b65c2aeb7c88415a910c1417bfd16b758
font_01_sfnt_off000102a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 10632 bytes
SHA-256: b4977faf1e76dd1cccd5005342647fb3f387c4f152848c3357d02f23694cbd0a